Physical Setting / Chemistry - New York Regents June 2013 Exam

Directions (1–30): For each statement or question, record on your separate answer sheet the number of the
word or expression that, of those given, best completes the statement or answers the question. Some questions
may require the use of the 2011 Edition Reference Tables for Physical Setting/Chemistry.

1 According to the wave-mechanical model of the
atom, an orbital is a region of the most probable
location of
(1) an alpha particle (3) an electron
(2) a gamma ray (4) a proton

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Hint

Half-n-half Clue

2.

2 Which particles have approximately the same
mass?
(1) an electron and an alpha particle
(2) an electron and a proton
(3) a neutron and an alpha particle
(4) a neutron and a proton

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Half-n-half Clue

3.

3 During a flame test, a lithium salt produces a
characteristic red flame. This red color is produced
when electrons in excited lithium atoms
(1) are lost by the atoms
(2) are gained by the atoms
(3) return to lower energy states within the atoms
(4) move to higher energy states within the atoms

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Half-n-half Clue

4.

4 Compared to the energy and charge of the
electrons in the first shell of a Be atom, the
electrons in the second shell of this atom have
(1) less energy and the same charge
(2) less energy and a different charge
(3) more energy and the same charge
(4) more energy and a different charge

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Half-n-half Clue

5.

5 Which quantity can vary among atoms of the
same element?
(1) mass number
(2) atomic number
(3) number of protons
(4) number of electrons

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Half-n-half Clue

6.

6 Which substances have atoms of the same
element but different molecular structures?
(1) He(g) and Ne(g) (3) K(s) and Na(s)
(2) O2(g) and O3(g) (4) P4(s) and S8(s)

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Half-n-half Clue

7.

7 An atom that has 13 protons and 15 neutrons is
an isotope of the element
(1) nickel (3) aluminum
(2) silicon (4) phosphorus

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Half-n-half Clue

8.

8 Which elements have the most similar chemical
properties?
(1) Si, As, and Te (3) Mg, Sr, and Ba
(2) N2, O2, and F2 (4) Ca, Cs, and Cu

10 In a bond between an atom of carbon and an
atom of fluorine, the fluorine atom has a
(1) weaker attraction for electrons
(2) stronger attraction for electrons
(3) smaller number of first-shell electrons
(4) larger number of first-shell electrons

12 Which statement defines the temperature of a
sample of matter?
(1) Temperature is a measure of the total
electromagnetic energy of the particles.
(2) Temperature is a measure of the total
thermal energy of the particles.
(3) Temperature is a measure of the average
potential energy of the particles.
(4) Temperature is a measure of the average
kinetic energy of the particles.

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Half-n-half Clue

13.

13 For a chemical reaction, the difference between
the potential energy of the products and the
potential energy of the reactants is equal to the
(1) heat of fusion
(2) heat of reaction
(3) activation energy of the forward reaction
(4) activation energy of the reverse reaction

15 Which statement describes the particles of an
ideal gas, based on the kinetic molecular theory?
(1) The motion of the gas particles is orderly
and circular.
(2) The gas particles have no attractive forces
between them.
(3) The gas particles are larger than the dis-
tances separating them.
(4) As the gas particles collide, the total energy
of the system decreases.

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Half-n-half Clue

16.

16 Two grams of potassium chloride are completely
dissolved in a sample of water in a beaker. This
solution is classified as
(1) an element
(2) a compound
(3) a homogeneous mixture
(4) a heterogeneous mixture